Hi, I just wonder if anyone have done any calc according to the new NORSOK standard L002:

[link Point to another website Only the registered members can access] In this standard is stated that you should check the local stress acc to Kellogg, the stress in the trunnion and also the weld.
My question how I should check the weld between the welded attachement and the pipe. I supposed to use the check describe in NS3472 which is same as in eurocode EN-1993-1-8. I assume that I should look up the load factor and take for instance 1.3 and use approiate material factor thats ok but how should I include the pressure strain?

REgards
David

From NORSOK

6.17.4 Welded attachments
Stresses introduced in pipe due to loads from welded attachments (i.e. trunnion supports), shall be examined.Stresses in the trunnion/pipe interface and in the trunnion proper shall be evaluated by a qualified pipe stress engineer, see ASME B 31.3, para 301.1.
NOTE It is recommended to use method described in M.W. Kellogg “Piping Design” taking into consideration the prevailing cross sectional forces and moments, also those not originating from trunnion reactions. The stresses shall in operating conditions be limitedto 1,5 x f for straight pipe and 1,0 x S for elbows (S = ASME B 31.3 allowable stress limit, see 6.17.1), while in blast scenario, the stress limit should be the same as the blast stress limit for the pipe itself, see 6.8.
Stresses in the trunnion proper shall be analysed using methods outlined in NS 3472 with allowable stresses accordingly (von Mises criteria). In operating cases, NORSOK ultimate limit state load factors and NS material factors shall apply. In the blast scenario, load factors and material factors shall be set to 1,0 and the stress limit should be the same as the blast stress limit for the pipe itself.
Stresses in the weld between trunnion and process pipe (or between trunnion and reinforcement pad) shall be evaluated using methods outlined in NS 3472. Flat plate approximation of the weld cross-section may be done. In case of no reinforcement pad, the effects of pressure strain in the weld shall be included. In the operating cases, NORSOK N-001, Section 6, ultimate limit state partial action factors (load factors) and NORSOK N-004, Section 6.1, material factors shall apply. In the blast scenario, partial action factors shall be set to 1,0.